[#bsl-basic_syncbuf-xsputn-0d]
= xref:bsl.adoc[bsl]::xref:bsl/basic_syncbuf.adoc[basic_syncbuf]::xsputn
:relfileprefix: ../../
:mrdocs:

Multiple character insertion.

== Synopsis

Declared in `<bslstl_syncbuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
streamsize
xsputn(
    char_type const* __s,
    streamsize __n);
----

== Description

Writes ___s[0]_ through ___s[]_ to the output sequence, as if by `sputc().` Stops when either _n_ characters have been copied, or when `sputc()` would return `traits::eof().`

It is expected that derived classes provide a more efficient implementation by overriding this definition.

== Return Value

The number of characters written.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *__s*
| A buffer area.
| *__n*
| Maximum number of characters to write.
|===


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